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Japan Engine

UEC50LSH-Eco

Main Engine 2-Stroke · Main Engines (2-Stroke)

Technical data from manufacturer or class sources · not yet verified by a person​​‍‌‌​‍​​‍⁠​⁠‌⁠​‌‌‍‍
5 / 8Cylinders
500 mmBore
1,950 mmStroke
5,200-9,600 kW (5-8 Cyl)Capacity
HFO / VLSFO / MGOMedium

The UEC50LSH‑Eco is a medium‑power, electronically controlled 2‑stroke low‑speed crosshead diesel main engine designed for direct‑drive installation on merchant vessels, notable for its flexible fuel capability and IMO Tier II/III emissions compliance.

Specifications

Technical data.

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Type2-Stroke Low-Speed Crosshead Diesel Engine
TierIMO Tier II/III
Drive TypeDirect Drive
ConstructionCrosshead, electronically controlled (Eco series)
Service

Service notes.

What our service work and the manufacturer documentation say about keeping this model running.

Standard 2-Stroke intervals per J-ENG manual.

Inspection

Common failures & inspection points

Inspection

Inspector Detail ✓ verified

Designation decoded

UEC für Mitsubishi/J-ENG, 50 für Bohrung 500 mm, LSH für Long Stroke H-Type (neueste Generation), Eco für Effizienz-Optimierung. Specs: Hub 1950 mm, 5-8 Zylinder, IMO Tier II/III.

Background

Der UEC50LSH-Eco ist J-ENGs aktuelle Generation in der 500-mm-Klasse mit elektronischer Steuerung. J-ENG (ehem. Mitsubishi UE Diesel) ist der dritte 2-Takt-Motorenhersteller neben MAN und WinGD mit ca. 5-8% globalem Marktanteil. LSH-Eco ist auf niedrigen Brennstoffverbrauch und EEDI Phase 3 optimiert. Primär auf japanischen Neubauten über Exklusiv-Lizenznehmer eingesetzt. Hub 1950 mm bei 500 mm Bohrung ergibt S/B 3.9.

Calculated metrics

Stroke to bore ratio3.9

Inspector checklist

Laufzeug & Tribologie
  • Zylinderlaufbuchse: 500 mm Bohrung, Hub 1950 mm, S/B 3.9 — moderates Hub-Bohrungs-Verhältnis, Verschleißmessung an 8 Punkten
  • Kolbenringe: Neueste UEC-Generation — Verschleiß und Blow-by dokumentieren
  • Kreuzkopf-Lager: Bei S/B 3.9 moderate Seitenkräfte — Lagerspiel
Elektronische Steuerung (LSH-Eco)
  • J-ENG LSH-Eco-System — eigenständige Plattform, nicht MAN ME oder WinGD UNIC
  • Einspritz-Aktuatoren: Eco-optimiertes Timing
  • Software-Version gegen J-ENG Service Information prüfen
  • Slow-Steaming-Konfiguration: LSH-Eco ist dafür optimiert
Brennstoffaufbereitung
  • Einspritzdüsen: Eco-optimierte Geometrie — Sprühbild
  • Kraftstoff-Separation: Cat-Fine-Entfernung
Dichtungssysteme
  • Stopfbuchse: Drainage-Raten und Trend
  • Auslassventil: Elektronisch gesteuert
Turbolader
  • Turbolader: 1× Mitsubishi MET — keine Redundanz
  • Spülluft-Kühler: Kühlleistung bei Slow-Steaming

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur nach Zylinder340-410 °C bei 85% MCRSpread >20 °C → Einspritz-Problem
Scavenge Air Pressure2.0-3.0 bar abs bei MCRTurbolader prüfen
spezifischer BrennstoffverbrauchEco-optimiert — Baseline bei Inbetriebnahme dokumentierenAnstieg → Verbrennungsoptimierung prüfen
Zylinderöl-Feed-Rate0.5-0.8 g/kWhBN-Matching

Common Failure Modes

  • Steuerungs-Fehler

    Symptoms: Effizienz-Verlust, Alarme

    Causes: Software-/Sensor-/Aktuator-Probleme

    Preventive: Software aktuell halten, Sensoren kalibrieren

  • Liner-Kaltkorrosion bei Slow-Steaming

    Symptoms: Cloverleafing, BN-Verbrauch

    Causes: Niedrige Temperatur bei Teillast

    Preventive: Kühlwasser 80-90 °C, BN anpassen

  • Turbolader-Ausfall

    Symptoms: Leistungsverlust (keine Redundanz)

    Causes: Lager/Verschmutzung

    Preventive: Water-Wash, Ersatz-Rotor

Expert tips

  • UEC50LSH-Eco mit S/B 3.9: Moderateres Hub-Bohrungs-Verhältnis als der C2-Variant (S/B 4.6) — unterschiedliche Kreuzkopf-Belastung beachten
  • J-ENG mit 5-8% Marktanteil: Nischenprodukt, aber technisch ausgereift — Erfahrungsaustausch über J-ENG User Forum nutzen
  • Eco-Baseline: Performance-Daten bei Inbetriebnahme als Referenz dokumentieren — Eco-Degradation quantifizieren

Related components

  • Turbolader (1×, Mitsubishi MET)
  • Elektronische Steuereinheit LSH-Eco
  • Aktuatoren
  • Zylinderöl-System
  • Brennstoff-Separatoren

Classification & regulatory

IMO Tier II/III. EEDI Phase 3. LSH-Eco ist J-ENGs aktuellste Plattform für Neubauten.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.

Spares

Replacement Parts

Spare parts notes

J-ENG (Tokyo) / Mitsui E&S. Lead time: 3-6 Wochen Asia.

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